I wish Berlin would just build more housing instead. For example when I cross the street there is a supermarket. It's a single story building with a huge parking lot around it. Why not make it a multistory building with apartments on top of the supermarket and skip the parking space or put it underground? Why does the city give out building permits for such buildings? There could easily be room for thirty families on…
The amount of unused space is Berlin is just so massive. Even in Friedrichstraße, which is a hype neighborhood with great amount of activity, you have hundreds of square meters completely unused, with wild plants growing around and random waste accumulating. From what I understand it is very difficult to do something with that space, either because people refuse to sell or because of bureaucratic red tape.
What's wrong with that? Enjoy the little green space you have left while it lasts. Have a BBQ with friends over there, maybe? The gentrifiers/developers won't be so long to remove every last bit of green and freedom in your neighborhood, as they did everywhere else.